Before dumping a boiler, the boiler heating surface should be ___.

The most common type of dynamic pump is a ___ pump.

The specific gravity of water is 2.0.

The specific gravity of water is 2.0.

At least once a month, a low water fuel cutoff should be tested with an evaporation test.

Heat is generated in a boiler by the combustion of a fuel such as gas or fuel oil.

Any maintenance and cleaning of the low water fuel cutoff must be done while there is no pressure on the boiler.

Makeup water is untreated and contains some scale-forming salts that can affect boiler heating surfaces.

At least once a month, a low water fuel cutoff should be tested with an evaporation test.

A nonreturn valve is a type of globe valve that allows a boiler to be cut in on-line automatically when the boiler pressure is at or above the header pressure and allows the boiler to be taken off-line automatically if the pressure in the boiler drops below the header pressure.